During their mission inside Grundoch Hive Hanwalt’s mech was damaged by hidden explosives. That was right after his new partner said to split up.
Hanwalt was stuck and tried to contact HQ but the link was dead. Hesitantly he left the protective hull of his mech. He had to make a choice: going back or continuing the mission.

After what felt like a thousand years he started moving.
To search and to rescue.